ADDENDUM: Provided here are several photos that we were unable to fit into the print version of “Wire Wrapping Revisited” by Wolfgang Matthes

More modules examples (similar to Figure 1):

Relay and power modules to be stacked onto a microcontroller module. Obviously, such a module must be located at the top. Therefore, it is no call to provide additional stackable connectors.

Stackable modules with housings that match. It looks fine. However, one can only use the respective module. Multi-module configurations are obviously not supported.

The small application system to the left consists of a microcontroller board and an LCD module. Obviously, it is not that easy to add further modules. But what to do if the two buttons are not enough? Here, a keypad and a connector for a PS/2 keyboard are shown. However, the parts have to be connected by jumper wires. They must be deposited loosely on the table or held in the hand because the boards do not even have mounting holes.

More application examples (similar to Figure 4 and Figure 5:

Experimenting with LEDs and relays.

LED-array modules can be inserted horizontally or vertically (the latter, for example, to demonstrate bar graph displays).

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